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  • Chemistry  (5,694)
  • Inorganic Chemistry  (739)
  • Analytical Chemistry and Spectroscopy  (566)
  • INSTRUMENTATION AND PHOTOGRAPHY  (249)
  • 1995-1999
  • 1980-1984
  • 1975-1979  (5,943)
  • 1965-1969
  • 1960-1964
  • 1976  (5,943)
Collection
Keywords
Publisher
Years
  • 1995-1999
  • 1980-1984
  • 1975-1979  (5,943)
  • 1965-1969
  • 1960-1964
Year
  • 1
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    NASA's present and future sensor technology developments (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-08-28
    Description: NASA's overall sensing, data acquisition, and instrumentation programs are reviewed. The review shows that the trends in advanced sensor technology involve increased use of solid-state sensors, multiapplication sensors, standardized instrumentation, and miniaturized detectors. Examples are given of several new technologies, showing how improvements in sensor operational capability (such as enhanced sensitivity and spectral range) derived from these advances have resulted in relaxed spacecraft stability requirements, mission time savings, and savings in weight, size, and power. The introduction of multiapplication sensors and standardized instrumentation will result in measurement cost reduction and improved compatibility with standardized spacecraft.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: AIAA PAPER 76-977 , Systems Design Driven by Sensors; Oct 18, 1976 - Oct 20, 1976; Pasadena, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 2
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    Space Photography 1977 Index (1976)
    In:  CASI
    Details
    Publication Date: 2019-08-28
    Description: An index is provided to representative photographs and transparencies available from NASA. Subjects include spacecraft, astronauts, lunar surface, planets and outer space phenomena, earth observations, and aviation. High altitude aircraft infrared photographs are included along with artists' conceptions of space shuttle and space colonies.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: NASA-TM-X-74628
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 3
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    Hygroscopic Properties of Magnetic Recording Tape (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-08-14
    Description: Relative humidity has been recognized as an important environmental factor in many head-tape interface phenomena such as headwear, friction, staining, and tape shed. Accordingly, the relative humidity is usually specified in many applications of tape use, especially when tape recorders are enclosed in hermetically sealed cases. Normally, the relative humidity is believed regulated by humidification of the fill gas to the specification relative humidity. This study demonstrates that the internal relative humidity in a sealed case is completely controlled by the time-dpendence of the hygroscopic properties of the pack of magnetic recording tape. Differences are found in the hygroscopic properties of the same brand of tape, which apparently result from aging, and which may have an effect on the long-term humidity-regulating behavior in a sealed case, and on the occurrence of head-tape interface phenomena from the long-term use of the tape. Results are presented on the basic hygroscopic properties of magnetic tape, its humidity-regulating behavior in a sealed case, and a theoretical commentary on the relative humidity dependence of head-wear by tape, is included.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: IEEE Transactions on Magnetics; MAG-12; 126-135
    Format: text
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    NASA TECHNICAL REPORTS
  • 4
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    NASA atomic hydrogen standards program - An update (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Some of the design features of NASA hydrogen masers are discussed including the large hydrogen source bulb, the palladium purified, the state selector, the replaceable pumps, the small entrance stem, magnetic shields, the elongated storage bulb, the aluminum cavity, the electronics package, and the autotuner. Attention is also given to the reliability and operating life of these hydrogen atomic standards.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Annual Frequency Control Symposium; Jun 02, 1976 - Jun 04, 1976; Atlantic City, NJ
    Format: text
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    NASA TECHNICAL REPORTS
  • 5
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    Optical vs. electronic enhancement of remote sensing imagery (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Basic aspects of remote sensing are considered and a description is provided of the methods which are employed in connection with the optical or electronic enhancement of remote sensing imagery. The advantages and limitations of various image enhancement methods and techniques are evaluated. It is pointed out that optical enhancement methods and techniques are currently superior to electronic ones with respect to spatial resolution and equipment cost considerations. Advantages of electronic procedures, on the other hand, are related to a greater flexibility regarding the presentation of the information as an aid for the interpretation by the image analyst.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Seminar on Image processing; Feb 24, 1976 - Feb 26, 1976; Pacific Grove, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 6
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    Multiplexor and sensor system tradeoff study (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The influence of certain sensor parameters on the accuracy of information extracted from satellite image data is studied, using a digital processing flow to simulate the effects of the sensor parameters. The method employed was to select representative images; scan and digitize them; process the digital data to simulate the effects of presampling filters, instantaneous field of view (IFOV) size and shape, sampling rates, noise, and word length; record the processed data on film; evaluate the film images; and draw conclusions from the evaluations. The study showed that presampling filters are not required to suppress aliasing, that the choice of square and circular IFOV shapes is not important, and that increased horizontal and vertical sampling rates produce an increase in apparent resolution. Work with low-contrast targets revealed a definite maximum in the tradeoff between IFOV size and SNR.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Seminar on Image processing; Feb 24, 1976 - Feb 26, 1976; Pacific Grove, CA
    Format: text
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    NASA TECHNICAL REPORTS
  • 7
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    A large imaging array CCD program (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Test results on charge coupled device (CCD) imaging arrays (100 x 160 pixel and 400 x 400 pixel) employed as imaging detectors are reported, along with expected low light level (LLL) performance. Reasons for selection of a thinned backside-illuminated buried-channel three-phase CCD variant are indicated. The LLL performance and long storage time capability of the CCD imaging array recommend it for stellar photometry, detection and tracking of faint objects, and other astronomical applications.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Seminar on Low light level devices for science and technology; Mar 22, 1976 - Mar 23, 1976; Reston, VA
    Format: text
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    NASA TECHNICAL REPORTS
  • 8
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    A technique for measurement of material damping in metals (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The paper outlines the theory, design, and application of an apparatus based on the single beam resonant dwell technique to determine the damping capacity of metallic materials by measuring the response of a structural element to excitation at a modal frequency. In this apparatus, a cantilever beam specimen of a test material is clamped to a bar which is connected at one end to an electromagnetic shaker and at the other to a heavy base. The thickness of the bar at the base end is reduced by two saw cuts to provide a pivot around which the remainder of the bar can rotate when excited by the shaker which is connected to the bar by a rod passing through a hole in the base. The response of the supporting system to shaker excitation is measured with an accelerometer mounted on the bar at the root of the specimen. Specimen response is measured optically with a low-power microscope with a reticle. Specimen loss factor is determined in terms of acceleration at the beam root, beam tip displacement, and the beam natural frequency.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Annual Meeting of Acoustical Society of America; Apr 05, 1976 - Apr 09, 1976; Washington, DC
    Format: text
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    NASA TECHNICAL REPORTS
  • 9
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    Intensified charge coupled devices for ultra low light level imaging (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: Development of a sensor incorporating a CCD and photocathode for operation in the electron bombarded mode in both a magnetic and an electrostatic focussed, gated configuration is described. Initial format size is 100 x 160 pixels with eventual growth to 400 x 400 pixels. The sensor is part of a digital camera system which includes the low level video conditioning electronics, a camera controller, a high speed buffer memory, and digital recording and display electronics. The memory uses CMOS/SOS and has a capacity of 1.6 Mbits with operating rates of 48 Mbits/sec. Individual frames are co-added to provide wide dynamic range and photometric precision better than 1%. A 4-bit video quantization is used to increase the photon counting detection rate before coincidence losses become serious.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: Seminar on Low light level devices for science and technology; Mar 22, 1976 - Mar 23, 1976; Reston, VA
    Format: text
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    NASA TECHNICAL REPORTS
  • 10
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    Magnetostrictive ultrasonic probes (1976)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The principles underlying the design and use of magnetostrictive ultrasonic probes is illustrated by oscillograms and sketches. Attention is given to such concepts as magnetostrictive transduction, broadband pulse shaping, guided wave propagation, wave impedance, reflection, transmission, and attenuation coefficients, coupling methods, and impulse-induced resonance. A number of applications of such probes are discussed including the measurement of elastic moduli, temperature, and acoustic emission and resonance studies.
    Keywords: INSTRUMENTATION AND PHOTOGRAPHY
    Type: SESA PAPER 2491 , Spring Meeting of Society for Experimental Stress Analysis; May 09, 1976 - May 14, 1976; Silver Spring, MD
    Format: text
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    NASA TECHNICAL REPORTS
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